Tableau Reader can only access worksheets that have been packaged by Tableau (.twbx files). The data must be in the form of a flat file (Excel, Access, CSV), a local cube, or a Tableau Data Extract file to be embedded in the worksheet. While other types of data sources can be saved in a.twbx file, Tableau Reader will not be able to open such a file.
The best method, as Inox indicated, is to extract the data and construct the bundled worksheet that way. If extracting the data isn't feasible, Tableau Server or Tableau Online will be required to distribute the workbooks.